Research And Design Of Miniaturized Base Station Antennas

The 5G?Fifth Generation Mobile Communication System?trial network has been launched,and large-scale commercial is coming soon;4G is still widely used and in-depth development.Among them,the Massive MIMO base station antenna is an edge tool for improving capacity and speed,and has become a research hotspot and application mainstream in the 5G and latter 4G era.based on system requirements?such as activation of base station equipment?,performance requirements?such as reducing mutual coupling between radiating elements?,and application requirements?such as restrictions on size,weight,cost etc?,radiating elements of Massive MIMO array antennas need to be miniaturized.This dissertation selects this direction with practical application background and technical difficulties as a research topic.Firstly,according to the application requirements from the North American mobile communication network,for the 32T/R Massive MIMO antenna array of the 1710MHz-2200MHz frequency band?2G,3G frequency band in China?adopted by the latter 4G,the spacing of the radiating elements at the low sideband is significantly less than half wavelength,resulting in strong mutual coupling between the radiation elements and poor isolation performance.Reducing the size of the radiating element is the key to technological breakthroughs.In this dissertation,the?-type radiating element based on?38?-type coupling feeding is proposed,reducing the size leads to the singular hopping into the low end of the frequency band.Further,the??-type radiation unit proposed in this dissertation reduces the mutual coupling and eliminates the singular hopping by introducing the corner cuting and loading branch on the radiation arms while reducing caliber size by 34.1%.The results show that the radiation performance can meet the design requirements.Secondly,according to the requirements of 5G,this dissertation proposes a low profile radiating element,which adopts the air microstrip patch structure,and designs the dual probe feeding and patch forming integration.It finally achieves a low profile of about 0.1₀?.The simulation shows its good performance,simple structure,easy processing,low cost,suitable for elements of 64T/R Massive MIMO base station antenna in three domestic 5G test frequency bands?2515MHz-2675MHz,3400MHz-3600MHz,4800MHz-4900MHz?and international 5G frequency bands n41,n78,n79?2496MHz-2690MHz,3300MHz-3800MHz,4400MHz-5000MHz?.Finally,for the above two Massive MIMO base station antennas with miniaturized radiating elements,we performed prototype productions and actual measurements.The measured results were in good agreement with the simulation results and reached the goal.The Massive MIMO array antenna products based on the designed radiating elements have been provided for market applications and have good practical value.